905521 has 4 divisors (see below), whose sum is σ = 953200. Its totient is φ = 857844.

The previous prime is 905507. The next prime is 905551. The reversal of 905521 is 125509.

905521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 905521 - 2¹³ = 897329 is a prime.

It is a Duffinian number.

905521 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 905492 and 905501.

It is not an unprimeable number, because it can be changed into a prime (905551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23811 + ... + 23848.

It is an arithmetic number, because the mean of its divisors is an integer number (238300).

2⁹⁰⁵⁵²¹ is an apocalyptic number.

It is an amenable number.

905521 is a deficient number, since it is larger than the sum of its proper divisors (47679).

905521 is a wasteful number, since it uses less digits than its factorization.

905521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47678.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 905521 is about 951.5886716434. The cubic root of 905521 is about 96.7459608335.

The spelling of 905521 in words is "nine hundred five thousand, five hundred twenty-one".